linux-kernel - Re: linux-next: build failure after merge of the net-next tree

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Message-ID: <20210820091627.2d071982@canb.auug.org.au>
Date:   Fri, 20 Aug 2021 09:16:27 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     David Miller <davem@...emloft.net>,
        Networking <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the net-next tree

Hi all,

On Sun, 15 Aug 2021 22:04:32 +1000 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> On Mon, 9 Aug 2021 15:21:41 +0200 Arnd Bergmann <arnd@...db.de> wrote:
> >
> > On Mon, Aug 9, 2021 at 12:20 PM Stephen Rothwell <sfr@...b.auug.org.au> wrote:  
> > >
> > > After merging the net-next tree, today's linux-next build (powerpc
> > > allyesconfig) failed like this:
> > >
> > > drivers/net/ethernet/cirrus/cs89x0.c: In function 'net_open':
> > > drivers/net/ethernet/cirrus/cs89x0.c:897:20: error: implicit declaration of function 'isa_virt_to_bus' [-Werror=implicit-function-declaration]
> > >   897 |     (unsigned long)isa_virt_to_bus(lp->dma_buff));
> > >       |                    ^~~~~~~~~~~~~~~    
> > 
> > Thank you for the report! I already sent a patch for m68knommu running into
> > this issue, but it seems there are other architectures that still have it.
> > 
> > The driver checks CONFIG_ISA_DMA_API at compile time to determine
> > whether isa_virt_to_bus(), set_dma_mode(), set_dma_addr(), ... are all
> > defined.
> > 
> > It seems that isa_virt_to_bus() is only implemented on most of the
> > architectures that set ISA_DMA_API: alpha, arm, mips, parisc and x86,
> > but not on m68k/coldfire and powerpc.
> > 
> > Before my patch, the platform driver could only be built on ARM,
> > so maybe we should just go back to that dependency or something
> > like
> > 
> >          depends on ARM || ((X86 || !ISA_DMA_API) && COMPILE_TEST)
> > 
> > for extra build coverage. Then again, it's hard to find any machine
> > actually using these: we have a couple of s3c24xx machines that
> > use the wrong device name, so the device never gets probed, the imx
> > machines that used to work are gone, and the ep7211-edb7211.dts
> > is missing a device node for it. Most likely, neither the platform nor
> > the ISA driver are actually used by anyone.  
> 
> I am still applying my patch removing COMPILE_TEST from this driver ..

Ping?  Did I miss a fix being merged?

-- 
Cheers,
Stephen Rothwell

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